<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th>
            <input type="checkbox" v-model="isCheckedAll" /> <span>全选</span>
          </th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <my-cart
          v-for="(item, index) in goodList"
          :key="index"
          :name="item.name"
          :price="item.price"
          :num="item.num"
          :checked="item.checked"
          @changeFn="changeFn"
          @delFn="delFn"
          @addFn="addFn"
          @cutFn="cutFn"
        />
        <!-- <tr>
          <td><input type="checkbox" /></td>
          <td>裴擒虎</td>
          <td>13888</td>
          <td>
            <button>-</button>
            <span>1</span>
            <button>+</button>
          </td>
          <td>总价</td>
          <td>
            <button>删除</button>
          </td>
        </tr> -->
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ allPrice }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import myCart from "./components/myCart.vue";
export default {
  components: {
    myCart,
  },
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
  computed: {
    isCheckedAll: {
      get() {
        return this.goodList.every((item) => item.checked);
      },
      set(val) {
        this.goodList.forEach((item) => (item.checked = val));
      },
    },
    allPrice() {
      return this.goodList.reduce((prev, item) => {
        if (item.checked) return prev + item.num * item.price;
        return prev;
      }, 0);
    },
  },
  methods: {
    changeFn(name) {
      let obj = this.goodList.find((item) => item.name === name);
      obj.checked = !obj.checked;
    },
    delFn(name) {
      this.goodList = this.goodList.filter((item) => item.name !== name);
    },
    addFn(name) {
      let obj = this.goodList.find((item) => item.name === name);
      obj.num++;
    },
    cutFn(name) {
      let obj = this.goodList.find((item) => item.name === name);
      if (obj.num) return obj.num--;
    },
  },
};
</script>

<style scoped>
table {
  text-align: center;
}
</style>
